Mo Farah's mother is left baffled by his return to running as he gears up for London Marathon

Sir Mo Farah eats a lot of pasta. Tonnes of the stuff. But not birthday cake, even though the London 2012 hero turned 40 today.

I’m A Celeb star Mo has ditched any showbiz trappings and is back in full bootcamp mode ahead of the London Marathon on April 23, after being forced to pull out last year with a hip injury.

So every week – even birthday ones – he runs 125 miles through the beautiful Ethiopian mountains, where he’s been training for the last month.